<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <div id="root">
      姓: <input type="text" v-model='firstName'> <br> <br>
      名: <input type="text" v-model='lastName'> <br> <br>
      <!-- 全名: <span>{{fullName()}}</span> -->
      全名: <span>{{fullName}}</span>
    </div>
</body>
<script>
    Vue.config.productionTip = false //组织vue在启动时生成生产提示

    new Vue({
        el:"#root",
        data:{
            firstName:'张',
            lastName:'三'
        },
        // methods:{
        //    fullName(){
        //      return this.firstName + '-' + this.lastName
        //    } 
        // },
        computed:{
            fullName:{
                 get(){
                     return this.firstName + '-' + this.lastName
                 },
                 set(value){
                    const arr = value.split('-')
                    this.firstName = arr[0]
                    this.lastName = arr[1]
                 }
            }
        }
    })
</script>
</html>